Using the Event Horizon Telescope project, observatories around the world are ready to begin measurements of the black hole at the center of the Milky Way.
Using the Event Horizon Telescope, astronomers are preparing to record an image of the heart of our galaxy for the first time. This global collaboration of radio dishes is set to take a detailed look at the black hole which is believed to be located at the center of the Milky Way. The Event Horizon Telescope links observatories all over the world to form a huge telescope, from Europe via Chile and Hawaii right down to the South Pole. The measurements are to run from April 4th to 14th initially.
At the end of the 18th century, the naturalists Pierre Simon de Laplace and John Mitchell were already speculating about “dark stars” whose gravity is so strong that light cannot escape from them. Theses ideas still lay within the bounds of Newtonian gravitational theory and the corpuscular theory of light. At the beginning of the 20th century, Albert Einstein revolutionized our understanding of gravitation – and thus of matter, space and time – with his General Theory of Relativity. And Einstein also described the concept of black holes.
Black holes are impossible to observe directly. They have such a large, extremely compacted mass that even light cannot escape from them; therefore they remain black. But by measuring gravitational waves from colliding black holes or by detecting the strong gravitational force they exert on their cosmic neighborhood, astronomers have nevertheless proven the existence of these gravitational traps indirectly. This force is the reason why stars moving at great speed orbit an invisible gravitational center, as happens at the heart of our galaxy, for example.
Scientists also believe it is also possible to observe a black hole by viewing the event horizon – the boundary around the black hole, beyond which light and matter are inescapably sucked in. At the very moment when the matter passes this boundary, the theory states it emits intense radiation, a kind of “death cry” and thus a last record of its existence. This radiation can be registered as radio waves in the millimeter range, among others. Consequently, it should be possible to image the event horizon of a black hole.
The Event Horizon Telescope (EHT) was designed to do precisely this. One main target of the project is the black hole at the center of the Milky Way galaxy, which is around 26,000 light years away from Earth and has a mass roughly equivalent to 4.5 million solar masses. Since it is so far away, the object appears at an extremely small angle.
One solution to this problem is offered by interferometry. The principle behind this technique is as follows: instead of using one huge telescope, several observatories are combined together as if they were small components of a single gigantic antenna. In this way scientists can simulate a telescope which corresponds to the circumference of our Earth. They want to do this because the larger the telescope, the finer the details which can be observed; the so-called angular resolution increases.
The Event Horizon Telescope project exploits this observational technique and in April will carry out observations at a frequency of 230 gigahertz, corresponding to a wavelength of 1.3 millimeters, in interferometry mode. The maximum angular resolution of this global radio telescope is around 26 micro-arcseconds. This corresponds to the size of a golf ball on the Moon or the breadth of a human hair as seen from a distance of 500 kilometers!
These measurements at the limit of what is observable are only possible under optimum conditions, i.e. at dry, high altitudes. These are offered by the IRAM observatory, partially financed by the Max Planck Society, with its 30-metre antenna on Pico Veleta, a 2800-meter-high peak in Spain’s Sierra Nevada. Its sensitivity is surpassed only by the Atacama Large Millimeter Array (ALMA), which consists of 64 individual telescopes and looks into space from the Chajnantor plateau at an altitude of 5000 meters in the Chilean Andes. The plateau is also home to the antenna known as APEX, which is similarly part of the EHT project and is managed by the Max Planck Institute for Radio Astronomy.
The 30-meter telescope on Pico Veleta in the Spanish Sierra Nevada is one of the two radio astronomy facilities operated by IRAM. It is one of today’s largest and most sensitive radio telescopes for tracing millimeter waves.
The Max Planck Institute in Bonn is furthermore involved with the data processing for the Event Horizon Telescope. The researchers use two supercomputers (correlators) for this; one is located in Bonn, the other at the Haystack Observatory in Massachusetts in the USA. The computers will evaluate data from the galactic black hole and take a close look at at least five further objects: the M 87, Centaurus A and NGC 1052 galaxies as well as the quasars known as OJ 287 and 3C279.
From 2018 onwards, a further observatory will join the Event Horizon Telescope project: NOEMA, the second IRAM observatory on the Plateau de Bure in the French Alps. With its ten high-sensitivity antennas, NOEMA will be the most powerful telescope of the collaboration in the northern hemisphere.